Sarah Ridgeway, the mother of 10-year-old Jessica Ridgeway is comforted by friends as she sits in on a news conference at the courthouse in Golden, Colo., on Tuesday, Oct. 1, 2013. Sarah had just attended a court hearing where Austin Sigg, 18, plead guilty to killing her daughter Jessica Ridgeway in October 2012. (AP Photo/Ed Andrieski)

GOLDEN, Colo. (AP) — A Colorado teen charged with kidnapping and killing a 10-year-old girl pleaded guilty Tuesday to all 22 charges against him, against the advice of his attorneys.

Austin Sigg, 18, could be sent to prison for the rest of his life for the October 2012 slaying of Jessica Ridgeway in Westminster. Jessica was abducted while walking to school, and her disappearance panicked thousands of residents in Denver’s western suburbs.

Sigg also pleaded guilty Tuesday to a May 2012 attack on a 22-year-old jogger at a lake in Jessica’s neighborhood.

Prosecutors said Sigg entered the pleas because of overwhelming evidence against him. His trial would have started Thursday.

“The writing was on the wall,” Jefferson County District Attorney Peter Weir said after the hearing.

Sigg faces a minimum sentence of 40 years in prison with the possibility of parole when he is sentenced Nov. 8. Prosecutors asked Judge Stephen Munsinger to impose consecutive sentences so Sigg spends the rest of his life behind bars.

Sigg cannot face the death penalty because he was 17 at the time of the slaying.

“In this case, there has been justice for Jessica,” Weir said.

Defense attorney Mitch Ahnstedt told the court that Sigg was entering the pleas against his lawyers’ counsel.

The families of both Jessica and Sigg were in the courtroom Tuesday. Sigg spoke only to answer the judge’s questions about whether he understood what he was agreeing to.

As a prosecutor started to describe how Sigg grabbed Jessica and pulled her into his car, Jessica’s mother, Sarah Ridgeway, left the courtroom. Defense attorneys asked the prosecutor to stop, saying Sigg already had pleaded guilty.

Sigg’s pleas came two days before he was to stand trial.

Jessica, a fifth-grader, left home to walk to school in Westminster on Oct. 5, 2012. She never arrived.

Hundreds of people helped search for her. Jessica’s backpack was found two days later in Superior, a town about 6 miles from her home. Days after that, human remains later identified as Jessica’s were found in a park.

Authorities, meanwhile, urged residents to watch for any suspicious changes in neighbors’ behavior. Officers guarded crosswalks and photographed cars in the area. Parents escorted their children to and from area schools. Mailboxes and trees were encircled by ribbons in Jessica’s favorite color, purple.

On Oct. 19, 2012, a resident contacted authorities to alert them to Sigg because he reportedly had a fascination with death, Westminster police Detective Luis Lopez testified at a preliminary hearing. FBI agents took a DNA sample from Sigg.

On Oct. 23, Sigg’s mother, Mindy Sigg, called 911, saying her son wanted to confess.

Investigators said Sigg told them some of Jessica’s remains were hidden in a crawl space in his mother’s home, where he lived. They said Sigg described how he abducted Jessica as she walked past his car. He said he bound her arms and her legs, drove around for a little bit, then took her to his house.

There, he told investigators, Sigg tried to strangle the girl and then used his hands to kill her. He also allegedly told investigators that he dismembered Jessica in a bathtub.

Lopez said Sigg’s DNA was found on Jessica’s clothing.

Sigg dropped out of high school after the 11th grade and later earned a graduate equivalency diploma. Former classmates say he was intelligent but complained about school and was bullied for having a high voice.

When asked about his criminal record on the 911 call, Sigg told the dispatcher: “The only other thing that I have done was the Ketner Lake incident where the woman got attacked. That was me.”

In the attack on the jogger, investigator Michael Lynch testified that Sigg used homemade chloroform to attempt to subdue the woman. She escaped.

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